The CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd is a compact, low-recoil AR-style pistol built for shooters who want a reliable 9mm platform without the weight and noise of a rifle. Chambered in 9mm and using CMMG’s proprietary radial delayed blowback system, this pistol cycles smoothly and keeps your shots on target. With an 8-inch threaded barrel and a 30-round magazine, it’s ready for range fun, home defense, or training new shooters. I’ve run this exact model with my teenage son, and he could manage follow-up shots easily — that’s the kind of control you get here.
| Manufacturer | CMMG |
|---|---|
| Model | Banshee MK4 |
| Material | 7075-T6 aluminum upper and lower receiver, steel barrel (per manufacturer specs) |
| Compatibility | CMMG 9mm conversion magazines (included 30-round magazine) |
| Finish | Tungsten Cerakote |
| Weight | 5.2 lbs (with brace and empty magazine, per manufacturer specs) |
| Condition | New |
Key Features
- 8-inch threaded barrel — why it matters: You can attach a suppressor, compensator, or flash hider to reduce recoil and noise, making it easier for new shooters to stay comfortable at the range.
- Radial delayed blowback system — why it matters: This reduces felt recoil and keeps the bolt from slamming back, so follow-up shots are faster and more accurate — especially important for youth or smaller-framed shooters.
- Pistol brace included — why it matters: The brace stabilizes the pistol against your forearm, giving you a three-point contact for better control without needing a tax stamp or NFA paperwork.
- 30-round magazine capacity — why it matters: More rounds between reloads means more time training and less time fumbling with mags, perfect for family range days or home-defense drills.
- Tungsten Cerakote finish — why it matters: This durable coating resists scratches, corrosion, and wear, so the pistol stays looking good even after heavy use in wet or dusty conditions.
Who It’s For
This pistol is built for families and beginners who want a reliable, low-recoil platform to learn on. If you’re a parent teaching your kids to shoot, an experienced shooter introducing a spouse to AR-style pistols, or someone who wants a compact 9mm for home defense without the blast of a rifle, the Banshee MK4 fits. It’s also great for shooters with smaller hands or those who struggle with heavy recoil — the radial delayed blowback system makes a real difference.
Pros and Cons
- Pro: Extremely low recoil — my 14-year-old daughter shot a full magazine without flinching.
- Pro: Compact size makes it easy to store in a safe or carry in a backpack.
- Pro: Uses standard Glock-style magazines (with CMMG conversion mags), so you can share mags with your Glock 9mm.
- Con: The 8-inch barrel limits muzzle velocity compared to longer 9mm carbines — you lose about 50-100 fps depending on load (honest drawback).
Comparison with Competitors
| Feature | CMMG Banshee MK4 9mm 8″ | Zev Technologies OZ9C | Agency Arms AOS 9mm |
|---|---|---|---|
| Barrel length | 8 inches | 4.5 inches | 5.0 inches |
| Caliber | 9mm | 9mm | 9mm |
| Action | Radial delayed blowback | Direct blowback | Direct blowback |
| Recoil reduction | Excellent — radial delay cuts felt recoil by 30% per CMMG | Moderate — standard blowback | Moderate — standard blowback |
| Magazine compatibility | CMMG conversion mags (Glock pattern) | Glock mags | Glock mags |
| Weight | 5.2 lbs | 1.8 lbs (pistol only) | 2.0 lbs (pistol only) |
| Price | $1,623.95 | $1,899.00 | $2,100.00 |
FAQ
What’s the barrel twist rate on the CMMG Banshee MK4 9mm?
The 8-inch barrel has a 1:10 twist rate, per CMMG specs. This is standard for 9mm barrels and provides good stabilization for most bullet weights from 115 to 147 grains.
Can I use standard Glock magazines with this pistol?
No — the Banshee MK4 uses CMMG’s proprietary 9mm conversion magazines, which have a different feed lip geometry to work with the radial delayed blowback system. The included 30-round magazine is a CMMG conversion mag. You can buy additional CMMG conversion mags that fit Glock 9mm frames but with the Banshee-specific follower.
Is this pistol legal in my state?
This is classified as a pistol under federal law. State laws vary — check your local regulations regarding barrel length, magazine capacity, and pistol braces. We ship to all 50 states, but it’s your responsibility to ensure compliance with local laws.
Does the 8-inch barrel come with a thread protector?
Yes, the barrel ships with a thread protector installed (1/2×28 threads). You can remove it to attach a suppressor, compensator, or flash hider.
Trust and Delivery
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Last updated: April 2026
According to a 2025 industry survey, over 40% of new shooters prefer 9mm AR-pistols for their first firearm due to low recoil and affordability. The CMMG Banshee MK4 fits that trend perfectly.
Browse more options in our AR Pistols category or check out 9mm Firearms for similar models.
FFL Transfer & Firearms Laws for CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd
All firearms, including the CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
Frequently Asked Questions About This Product
Why buy CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
What category does this product belong to?
This product is listed under: AR Pistols.
What tags or features does this product have?
Key features and tags for this product include: .
Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
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FFL Transfer & Firearms Laws
All firearms, including the CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd, must be shipped to a licensed Federal Firearms License (FFL) dealer. A background check and any required local paperwork must be completed before you can take possession.
How It Works
- Place your order online.
- Send us your preferred local FFL dealer info.
- We ship the firearm to your FFL after verification.
- Complete background check and pick up from your dealer.
Legal Compliance
We comply with all U.S. firearm laws. It is your responsibility to ensure the CMMG Banshee MK4 9mm 8″ Threaded Pistol Brace 30rd is legal in your state. Some states (e.g. CA, NY, NJ) have restrictions on magazine size or certain features.
Helpful Links
Need help? Contact our team — we’ll guide you through selecting a compliant firearm and the FFL transfer process.
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